Glossary: X

Xenobiota: Any biotum displaced from its normal habitat; a chemical foreign to a biological system.

Xeric: Habitat characterized by a low or inadequate supply of moisture; also, said of an organism or group of organisms existing in such a habitat.

Glossary: Y

Yard Waste: The part of solid waste composed of grass clippings, leaves, twigs, branches, and other garden refuse.

Yellow-Boy: Iron oxide flocculants (clumps of solids in waste or water); usually observed as orange-yellow deposits in surface streams with excess iron content.

Yield: The quantity of water (expressed as a rate of flow or total quantity per year) that can be collected for a given use from surface or groundwater sources.

Glossary: Z

Zero Air: Atmospheric air purified to contain less than 0.1 ppm total hydrocarbons.

Zooplankton: Small (often microscopic) free-floating aquatic plants or animals.

Zone of Saturation: The layer beneath the surface of the land containing openings that may fill with water.

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